#
#
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#

# Script to recreate all tables from one cluster to another
# To see usage for this script, run:
#
#  ${HBASE_HOME}/bin/hbase org.jruby.Main copy_tables_desc.rb
#

include Java
import org.apache.commons.logging.LogFactory
import org.apache.hadoop.hbase.HBaseConfiguration
import org.apache.hadoop.hbase.HConstants
import org.apache.hadoop.hbase.client.HBaseAdmin
import org.apache.hadoop.hbase.HTableDescriptor
import org.apache.hadoop.conf.Configuration

# Name of this script
NAME = "copy_tables_desc"

# Print usage for this script
def usage
  puts 'Usage: %s.rb master_zookeeper.quorum.peers:clientport:znode_parent slave_zookeeper.quorum.peers:clientport:znode_parent [table1,table2,table3,...]' % NAME
  exit!
end

def copy (src, dst, table)
  # verify if table exists in source cluster
  begin
    t = src.getTableDescriptor(table.to_java_bytes)
  rescue org.apache.hadoop.hbase.TableNotFoundException
    puts "Source table \"%s\" doesn't exist, skipping." % table
    return
  end

  # verify if table *doesn't* exists in the target cluster
  begin
    dst.createTable(t)
  rescue org.apache.hadoop.hbase.TableExistsException
    puts "Destination table \"%s\" exists in remote cluster, skipping." % table
    return
  end

  puts "Schema for table \"%s\" was succesfully copied to remote cluster." % table
end


if ARGV.size < 2 || ARGV.size > 3
  usage
end

LOG = LogFactory.getLog(NAME)

parts1 = ARGV[0].split(":")

parts2 = ARGV[1].split(":")

parts3 = ARGV[2].split(",") unless ARGV[2].nil?

c1 = HBaseConfiguration.create()
c1.set(HConstants::ZOOKEEPER_QUORUM, parts1[0])
c1.set("hbase.zookeeper.property.clientPort", parts1[1])
c1.set(HConstants::ZOOKEEPER_ZNODE_PARENT, parts1[2])

admin1 = HBaseAdmin.new(c1)

c2 = HBaseConfiguration.create()
c2.set(HConstants::ZOOKEEPER_QUORUM, parts2[0])
c2.set("hbase.zookeeper.property.clientPort", parts2[1])
c2.set(HConstants::ZOOKEEPER_ZNODE_PARENT, parts2[2])

admin2 = HBaseAdmin.new(c2)

if parts3.nil?
  admin1.listTableNames().each do |t|
    copy(admin1, admin2, t.nameAsString())
  end
else
  parts3.each do |t|
    copy(admin1, admin2, t)
  end
end